Curable Thermal Ink Composition for Smear-Resistant Printing
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Solution Overview
Problem
Conventional thermally-ejectable printing fluids are non-curable and prone to smearing and color running, requiring expensive piezoelectric printheads and involving organic solvents that need special handling and disposal, while curable fluids are not suitable for thermal ejection systems.
Innovation Solution
A curable, thermally ejectable printing fluid composition comprising a curable liquid-phase monomer, a non-aqueous volatile driver fluid, an initiator, and a phosphate ester resistor protectant, designed for use with thermal fluid ejection devices, allowing for rapid curing and integration into thermal printheads, reducing maintenance and solvent usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional thermally-ejectable printing fluids are used, then the printing device can operate with simple thermal printheads, but the fluids are non-curable and prone to smearing and color running
Solution Approach 1:
The patent changes the chemical parameters of the printing fluid by formulating a curable composition containing monomers, oligomers, and photoinitiators that can undergo polymerization. This allows the fluid to be ejected thermally like conventional fluids but then cured to achieve durable, smear-resistant printing, thus improving print quality while maintaining thermal printhead simplicity
Solution Approach 2:
The patent creates a composite printing fluid system combining curable polymer components (monomers and oligomers) with photoinitiators and conventional ink additives. This composite formulation enables both thermal ejection compatibility and subsequent curing capability, resolving the contradiction between simple printhead operation and high-quality durable printing
2Reliability
If curable printing fluids are used to achieve fast drying times, then smearing is reduced, but the fluids may not be printable via thermal ejection and require expensive piezoelectric printheads
Solution Approach 1:
The patent modifies the physical parameters of curable fluids by adjusting viscosity, surface tension, and boiling point through careful selection of monomer and oligomer combinations. These parameter adjustments enable the curable fluid to be compatible with thermal ejection mechanisms, eliminating the need for expensive piezoelectric printheads while maintaining fast drying capabilities
Solution Approach 2:
The patent makes curable printing fluid compatible with disposable or replaceable thermal printheads rather than requiring expensive permanent piezoelectric units. This allows the system to use cheaper thermal printhead technology while still achieving the fast drying and durable printing benefits of curable fluids
3Reliability
If curable printing fluids with organic solvents are used, then curability is achieved, but additional equipment and care are needed for safe evaporation and disposal
Solution Approach 1:
The patent replaces hazardous organic solvents with an aqueous-based inert environment formulation. The curable components are suspended or dissolved in water rather than volatile organic solvents, eliminating the need for special evaporation equipment and disposal systems while maintaining curing capability through photoinitiation
Solution Approach 2:
The patent extracts and removes hazardous organic solvent components from the printing fluid formulation, retaining only the essential curable components (monomers, oligomers, photoinitiators) in an aqueous base. This extraction eliminates the need for special solvent handling equipment while preserving the curable properties needed for durable printing
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables fast, durable printing on various substrates with reduced smearing and solvent outgassing, lowering printhead maintenance and costs by using thermal printheads, which are more cost-effective and suitable for high-speed applications.
Implementation Method 1
a substantially nonaqueous volatile driver fluid capable of being vaporized by a thermal fluid ejection printhead
Implementation Method 2
a curable liquid-phase monomer... an initiator
Data Source
AI summary
Various embodiments related to curable printing fluids are disclosed. One example embodiment provides a curable printing fluid composition for a thermal fluid ejection device, the composition comprising a curable liquid-phase monomer, a substantially nonaqueous volatile driver fluid capable of being vaporized by a thermal fluid ejection printhead, an initiator, a phosphate ester resistor protectant, and a colorant comprising a dye.